got a little board and decided to go back through my log book to see the different fuel additives ive run so far in the truck and what the mpg i been getting...

Lucas Fuel Stabilizer w/ injector cleaner (keep in mind when i was running this one i was running 3 injectors down and didnt know it at the time.. so i was essentially running a 5 cyl diesel)
16.5-22.2mpg highway
12.8-13.2mpg city
14.4-15.1 combined
15.7 aver of 16 tank spread

ill have to run that one again sometime to see what it does now on all 8 cyls..

Ford Winter performance improver (i do tend to remote start before starting off when cold so im sure this played a factor in there too..)
14.8-15.3 hwy
12.1-13.2city
14.1 ave for the combined (they sat between 14.1-14.3 for most of the sets)
13.93-infinity 16 tank sample

Optilube Winter
14.6-16.5 highway
10.7-12.4 city
13.5 combined
14.8 ave total 16 tank sampling (ironically same number of tanks i got to the gallon of the additive)